Terminal and communication method for performing doppler estimation

Abstract

A terminal includes a receiving unit configured to receive information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information relating to the arrangement of the tracking reference signal, and a controller configured to perform a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals in a time domain is variable.

The invention claimed is: 
     
       1. A terminal, comprising:
 a receiver configured to receive information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information relating to the arrangement of the tracking reference signal; and 
 a controller configured to perform a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals in a time domain is variable, 
 wherein a first tracking reference signal, a second tracking reference signal, and a third tracking reference signal are arranged in a first slot, and 
 wherein an interval in a time domain between the first tracking reference signal and the second tracking reference signal differs from an interval in a time domain between the second tracking reference signal and the third tracking reference signal. 
 
     
     
       2. The terminal as claimed in  claim 1 , wherein when a first tracking reference signal and a second tracking reference signal are arranged in a first slot and a third tracking reference signal and a fourth tracking reference signal are arranged in a second slot subsequent to the first slot, an interval between the second tracking reference signal and the third tracking reference signal in a time domain is variable. 
     
     
       3. The terminal as claimed in  claim 1 , wherein the information about the arrangement of the tracking reference signal is dynamically changed by layer  1  signaling. 
     
     
       4. The terminal as claimed in  claim 1 , further comprising:
 a transmission unit configured to transmit information indicating a capability to perform a Doppler estimation. 
 
     
     
       5. A communication method performed by a terminal, comprising:
 receiving information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information; and 
 performing a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals is variable in a time domain, 
 wherein a first tracking reference signal, a second tracking reference signal, and a third tracking reference signal are arranged in a first slot, and 
 wherein an interval in a time domain between the first tracking reference signal and the second tracking reference signal differs from an interval in a time domain between the second tracking reference signal and the third tracking reference signal.